-99.7% is the change from 336 to 1
Calculation steps:
[( 1 - 336 ) ÷ 336] x 100 = -99.7%
Formula
Percentage change = [(1 - 336) / 336] x 100
Subtract the new number by the original number
1 - 336 = -335
-335 ÷ 336 = -0.9970238095238095
-0.9970238095238095 x 100 = -99.7%